JP2514499Z - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION This invention is made of a non-magnetic material, and a permanent magnet is provided on one of the outer periphery of a piston fitted inside a cylinder tube and the inner periphery of a slider fitted outside a cylinder tube. The present invention relates to a rodless cylinder having a permanent magnet or a magnetic material fixed to the other and a slider being slid integrally with a piston by magnetic attraction between the permanent magnet and the permanent magnet or the magnetic material. Problems to be Solved by Conventional Techniques and Inventions As rodless cylinders utilizing magnetic attraction as described above, conventionally, a piston is inserted into a single circular cylinder tube that is fixed across a pair of head covers. A guide bar parallel to the cylinder tube is provided between the two head covers so as to penetrate the slider in order to prevent the slider from rotating around the axis of the cylinder tube. However, in the rodless cylinder having such a structure, since the ratio of the cross-sectional area of the cylinder tube to the cross-sectional area of the slider is small, the thrust generated by the action of pneumatic pressure on the piston is not enough for the weight of the slider. It is not large, and if you increase the diameter of the cylinder tube to obtain a large thrust, This causes a disadvantage that the slider becomes extremely large and its weight also increases significantly. Such a drawback also occurs when the slider is fixed and used to move the cylinder tube and the head cover. Therefore, a rodless cylinder capable of obtaining a large thrust while reducing the size and weight has been desired. Means for Solving the Problems The present invention provides, as a means for solving the above problems, a plurality of head covers made of a non-magnetic material and having a piston hermetically and slidably fitted between the head covers. The cylinder tubes are inserted and fixed in parallel to each other, and each of the pair of head covers is formed with one port through which pressurized air is supplied and discharged, and a passage communicating from the port to each cylinder tube, A slider formed with a plurality of through-holes is fitted to the plurality of cylinder tubes so as to be relatively slidable by fitting the through-holes to the outside, and either the outer circumference of the piston or the inner circumference of the through-hole is fitted. A permanent magnet is fixed to one side, and a permanent magnet or a magnetic body is fixed to the other, and the slider slides integrally with the piston by magnetic attraction between the permanent magnet and the permanent magnet or the magnetic body. It was made to move. Action and effect of the present invention The present invention has the above-described configuration, and when one of the slider and the head cover is fixed and the driven member is connected to the other to generate a thrust by supply of pressurized air, the slider or the head cover becomes The cylinder tube moves in the axial direction of the cylinder tube. At this time, the cylinder tube also serves as a guide bar for preventing the slider from rotating relatively around the axis of the other cylinder tube. Since there is no relative rotation between the cylinder tubes, and since the magnitude of the thrust is proportional to the total cross-sectional area of the cylinder tubes, the thrust can be arbitrarily changed by changing the diameter and number of cylinder tubes. The slider and head cover cross-sectional shape can be set according to the diameter and number of cylinder tubes. By appropriately setting the arrangement method, it is possible to obtain a desired shape such as a flat shape having a small thickness. In the rodless cylinder of the present invention, a plurality of cylinder tubes are provided to serve also as a guide bar for preventing the relative rotation of the slider with respect to the cylinder tube. The ratio of the total cross-sectional area of the cylinder tube to the cross-sectional area of the slider or the head cover is larger than that of the rodless cylinder, and this has the effect of obtaining a large thrust while reducing the size and weight of the slider and the head cover. is there. Further, since the plurality of cylinder tubes are fixed by the pair of head covers, the cylinder tubes can be simply and surely arranged in parallel without the center axes of the cylinder tubes being shifted from each other. In addition, in each of the pair of head covers, the supply and discharge of the pressurized air to and from the plurality of cylinder tubes can be performed by one port, so that the piping for supplying and discharging the pressurized air can be reduced, and the plurality of ports can be connected. The surrounding configuration can be simplified as compared with the case in which it is provided. An embodiment of the present invention will be described below with reference to the accompanying drawings. In the drawing, reference numerals 1 and 1 denote two cylindrical tubes made of a nonmagnetic material which are formed in a cylindrical shape having the same inner diameter and length and which extend in a horizontal plane between a pair of head covers 2 and 2 in parallel with each other. The cylinder tubes 1 and 1 are fixed by screwing both ends to two sealing bodies 3 and 3 fitted to each head cover 2, while each of the head covers 2 is Each of them has a port 4 connected to a pressurized air supply source (not shown), a flow hole 6 extending from a peripheral groove 5 on the outer periphery of the sealing body 3 into the hollow of the cylinder tube 1, 3, 3 circumferential grooves 5,
A communication hole 7 for communicating the five with each other is formed, so that the port 4 and the hollow portions of the two cylinder tubes 1 and 1 communicate with each other. Therefore, in this embodiment, a passage communicating from the port 4 to each cylinder tube 1 is formed by the communication hole 7 and the like. In the hollow of each cylinder tube 1, a pair of circular holding members 9a and 9 are respectively provided.
The piston 8 is formed by screwing the tip of a center rod 10 protruding from one of the holding members 9a to the other holding member 9b.
, 11 while being fitted so as to be concentric with the cylinder tube 1 by the wear rings 12 and 12 fitted to the outer sides of the holding members 9a and 9b. When pressurized air is supplied, the same pressure by the pressurized air acts on one end surface of both pistons 8, 8, whereby both pistons 8, 8 slide relatively in cylinder tubes 1, 1 at the same speed. It works. An annular shape is formed between both holders 9a and 9b of each biston 8, and one end face is N-shaped.
A plurality of permanent magnets 14 whose poles are S poles on the other end surface side are clamped side by side in the axial direction with the permanent magnets 14 fitted on the center rod 10. The N poles or the S poles are arranged via the plate 15 so as to correspond to each other. A rectangular slider 16 is disposed between the head covers 2 and 2 in a state where the two cylinder tubes 1 and 1 pass through the two through holes 17 and 17 concentrically. Between the inner periphery of the cylinder tube 1 and the outer periphery of the cylinder tube 1, respectively.
A plurality of permanent magnets 18 having an annular shape and having N and S poles at both ends are fitted in the cylinder tube 1 so as to be relatively slidably fitted on the cylinder tube 1. Are arranged so that the N poles and the S poles are adjacent to each other via an interposition plate 19 made of a magnetic material.
6, the N and S poles of the permanent magnets 14 of the piston 8 correspond to the respective permanent magnets 1 of the slider 16 as shown in FIG.
A magnetic attraction force is generated between the permanent magnets 14 and 18 by corresponding to the S pole and the N pole 8 in the radial direction with the thickness of the nonmagnetic cylinder tube 1 interposed therebetween. The rodless cylinder of this embodiment has the above-described configuration, and the two head covers 2 and 2 are fixed to a fixing member (not shown), and a slider 16 is connected to a driven member such as a table (not shown). When the supply of the pressurized air and the discharge of the pressurized air from the other port 4 are performed, the pistons 8, 8 slide with respect to the cylinder tubes 1, 1 at the same speed. Permanent magnet 14
Due to the magnetic attraction generated between the slider 1 and the permanent magnet 18 of the slider 16, the slider 1
6 slides in the horizontal direction integrally with the pistons 8, 8. On the contrary, when the driven member is connected to the head cover 2 while the slider 16 is fixed, the compressed air The head covers 2 and 2 and the cylinder tubes 1 and 1 move in the horizontal direction with respect to the pistons 8 and 8 and the slider 16 with the supply and discharge of the cylinder. During the above operation, one of the cylinder tubes 1 , And also serves as a guide bar for preventing relative rotation about the axis between the slider 16 and the other cylinder tube 1, the slider 16 and the head covers 2, 2
During the sliding, the posture is kept constant without rotating. A rodless cylinder according to the present embodiment having a configuration in which two cylinder tubes 1 and 1 penetrate through a slider 16, and a conventional rodless cylinder in which one cylinder tube and a guide bar for preventing rotation pass through the slider. As compared with, the ratio of the cross-sectional area of the cylinder tube to the cross-sectional area of the slider in a plane perpendicular to the axis of the cylinder tube is twice that of the conventional rodless cylinder. The thrust of the rodless cylinder of this embodiment is twice as large as the thrust of the conventional rodless cylinder because it is proportional to the cross-sectional area of the piston, that is, the cross-sectional area of the cylinder tube. If a large thrust is not required in the rodless cylinder of the present embodiment, the diameters of both cylinder tubes 1 and 1 may be reduced, and accordingly, the width and height of the slider 16 and the head cover 2 are reduced. Can be reduced in size, and can be made smaller and lighter. In the above embodiment, the rodless cylinder using two cylinder tubes 1 and 1 has been described. However, according to the present invention, the number of cylinder tubes may be three or more. By appropriately changing the diameter dimensions and the arrangement of the sliders, the cross-sectional shapes and dimensions of the slider and the head cover in a plane perpendicular to the cylinder tube, and the magnitude of the thrust can be arbitrarily set. For example, when a large number of cylinder tubes having a small diameter are arranged in parallel on a horizontal plane, the slider and the head cover can be formed into a flat shape having a small height. Similarly, in the above-described embodiment, the permanent magnets 14 and 18 are fixed to both the outer periphery of the piston 8 and the inner periphery of the through hole of the slider 16. Can be applied to a rodless cylinder in which a magnetic material such as an iron ring is fixed to the other.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings show an embodiment of the present invention, FIG. 1 is a perspective view, and FIG. 2 is a longitudinal sectional view. 1: Cylinder tube, 2: Head cover, 8: Piston, 14: Permanent magnet (of piston), 16: Slider, 17: Through hole, 18: Permanent magnet (of slider)

Claims (1)

[Claims for utility model registration] Between a pair of head covers, a plurality of cylinder tubes made of a non-magnetic material and having a piston air-tightly and slidably fitted therein are inserted in parallel with each other and fixed , and a pressure is applied to the pair of head covers, respectively. One port to supply and exhaust air
And a passage communicating with each of the cylinder tubes from the same port, and a slider formed with a plurality of through-holes in the plurality of cylinder tubes is relatively slid by externally fitting the through-holes. The permanent magnet is fixed to one of the outer periphery of the piston and the inner periphery of the through-hole, and a permanent magnet or a magnetic material is fixed to the other. Alternatively, the slider is made to slide integrally with the piston by a magnetic attraction force between the slider and the magnetic body.